static float bez2_time( float x0, float x1, float x2, float x3, float time,
float *t0, float *t1 )
{
float v, t;
t = *t0 + ( *t1 - *t0 ) * 0.5f;
v = bezier( x0, x1, x2, x3, t );
if ( fabs( time - v ) > .0001f ) {
if ( v > time )
*t1 = t;
else
*t0 = t;
return bez2_time( x0, x1, x2, x3, time, t0, t1 );
}
else
return t;
}
static float bez2( Key *key0, Key *key1, float time )
{
float x, y, t, t0 = 0.0f, t1 = 1.0f;
if ( key0->shape == SHAPE_BEZ2 )
x = key0->time + key0->param[ 2 ];
else
x = key0->time + ( key1->time - key0->time ) / 3.0f;
t = bez2_time( key0->time, x, key1->time + key1->param[ 0 ], key1->time,
time, &t0, &t1 );
if ( key0->shape == SHAPE_BEZ2 )
y = key0->value + key0->param[ 3 ];
else
y = key0->value + outgoing( (lwKey*)key0, key1 ) / 3.0f;
return bezier( key0->value, y, key1->param[ 1 ] + key1->value, key1->value, t );
}
static float bez2( lwKey *key0, lwKey *key1, float time ){
float x, y, t, t0 = 0.0f, t1 = 1.0f;
if ( key0->shape == ID_BEZ2 ) {
x = key0->time + key0->param[ 2 ];
}
else{
x = key0->time + ( key1->time - key0->time ) / 3.0f;
}
t = bez2_time( key0->time, x, key1->time + key1->param[ 0 ], key1->time,
time, &t0, &t1 );
if ( key0->shape == ID_BEZ2 ) {
y = key0->value + key0->param[ 3 ];
}
else{
y = key0->value + key0->param[ 1 ] / 3.0f;
}
return bezier( key0->value, y, key1->param[ 1 ] + key1->value, key1->value, t );
}
